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Diffstat (limited to 'bsps/bfin/include/libcpu/mmu.h')
| -rw-r--r-- | bsps/bfin/include/libcpu/mmu.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/bsps/bfin/include/libcpu/mmu.h b/bsps/bfin/include/libcpu/mmu.h new file mode 100644 index 0000000000..d6e2ea58a9 --- /dev/null +++ b/bsps/bfin/include/libcpu/mmu.h @@ -0,0 +1,73 @@ +/* Blackfin MMU Support + * + * Copyright (c) 2008 Kallisti Labs, Los Gatos, CA, USA + * written by Allan Hessenflow <allanh@kallisti.com> + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.org/license/LICENSE. + */ + + +/* NOTE: this currently only implements a static table. It should be made + to handle more regions than fit in the CPLBs, with an exception handler + to do replacements as needed. This would of course require great care + to insure any storage required by the exception handler, including any + stack space, the exception handler itself, and the region descriptors + it needs to update the CPLBs, are in regions that will never be + replaced. */ + +#ifndef _mmu_h_ +#define _mmu_h_ + +#include <libcpu/mmuRegs.h> + + +#define INSTR_NOCACHE (ICPLB_DATA_CPLB_USER_RD | \ + ICPLB_DATA_CPLB_VALID) + +#define INSTR_CACHEABLE (ICPLB_DATA_CPLB_L1_CHBL | \ + ICPLB_DATA_CPLB_USER_RD | \ + ICPLB_DATA_CPLB_VALID) + +#define DATA_NOCACHE (DCPLB_DATA_CPLB_DIRTY | \ + DCPLB_DATA_CPLB_SUPV_WR | \ + DCPLB_DATA_CPLB_USER_WR | \ + DCPLB_DATA_CPLB_USER_RD | \ + DCPLB_DATA_CPLB_VALID) + +#define DATA_WRITEBACK (DCPLB_DATA_CPLB_L1_AOW | \ + DCPLB_DATA_CPLB_L1_CHBL | \ + DCPLB_DATA_CPLB_DIRTY | \ + DCPLB_DATA_CPLB_SUPV_WR | \ + DCPLB_DATA_CPLB_USER_WR | \ + DCPLB_DATA_CPLB_USER_RD | \ + DCPLB_DATA_CPLB_VALID) + + +#ifdef __cplusplus +extern "C" { +#endif + + +typedef struct { + struct { + void *address; + uint32_t flags; + } instruction[ICPLB_COUNT]; + struct { + void *address; + uint32_t flags; + } data[DCPLB_COUNT]; +} bfin_mmu_config_t; + + +void bfin_mmu_init(bfin_mmu_config_t *config); + + +#ifdef __cplusplus +} +#endif + +#endif /* _mmu_h_ */ + |